With cocktails in hand, the two actor's engaged in their playful dancing at the Armani Exchange Neon Carnival as part of the Coachella festivities, reported Contactmusic.
"Julianne and Alex were flirting a lot. She was drinking vodka cocktails all night and by midnight she was standing on the back of a couch with her friends, dancing like crazy and rubbing up against (Alex)," a source said.
Hough, 24, ended her relationship with the TV host last month because their busy work schedules was getting in the way of their relationship.